Electric ignition apparatus



F. BILLON.

ELECTRIC IGNITION APPARATUS. APPLICATION FILED SEPT. 30. 1919 1,357,684, Patented Nov. 2, 1920.

PATENT OFFICE.

FREDERICK DILLON, OF SOLOTHUBN, SWITZERLAND;

ELECTRIC IGNITION APPARATUS.

Specification of i'etters Patent.

Patented Nov. 2, 1920.

Original application filed l uly 8. 1918, Serial No. 243,893. Divided and this application filed September so, 1919. semi no. 327.611.

is usual to employ rotary cam disk and stationary interrupter levers as the mechanism for interrupting the primary circuit. In such' apparatus however wherein it is desired to provide a means of adjustment of the point of ignition by hand. it is necessary that the interrupter levers shall be capable of being displaced by the desired angle of variation of the point of ignition. This displacement of the interrupter levers neces sitates that the connecting wire of the two interrupter contacts shall be either flexible or that brushes shall be employed for that purpose. Both constructions however entail an increase in the primary resistance of the ignition apparatus. which. as is well known, should be kept as low as possible.

The improved apparatus forming the subject matter of the present invention allows of obviating that drawback. The improved apparatus consists in the feature that an intermediate member is arranged so as to be capable of rocking on its axis in such a manner that its displacement takes place along an arc of a circle concentric to the said axis. The result of this is that the limiting surface of the rotating cam strikes the intermediate member always at the same angle and indemndently of the position of the said intermediate member. and that the force that effects the raising of the intermediate member remains the same in direction and amount for each variation.

The improved apparatus is constructed in such a manner that the intermediate member rocking on the axis of the apparatus is formed. with two arms of which one arm bears on the periphery of the cam disk while the other arm which is axially shifted relatively to the first arm engagesthe end of the movable'lever of the interrupter and is so arranged that this point of engagement is located in theiprolongation of the axis of the apparatus. This arrangement has the advantage that. in case of any desired displacement of the intermediate member. such as is required for varying the point of ignition. the point of engagement with the interrupter lever will always be situated in the prolongation of the axis of the apparatus and consequently the length of the etfective interrupter lever arm will remain unchanged. I

The broad idea of this invention set forth in this application is described and claimed in anapplication filed by me on July 8. 1918. and bearing Serial No. 243893. v In the accompanying diagrammatic draw- 1ng:

Figure 1 shows an elevation, and

Fig. 2 a longitudinal section of a construction wherein the intermediate member is formed of two parts. one of which bears on the cam disk while the other part actuates the interrupter lever. both parts moving in the same parallel planes.

Fig. 3 is an elevation of a construction wherein the intermediate transmission member consists of angle levers and a pivoted interrupter lever all moving in the same plane.

Fig. 4 is a longitudinal section of the mechanism shown in Fig. 3.

The interruption takes place between the stationarv contact a and the movable contact b. The contact I) is carried by one arm of a double-ended lever d, which is ivotcd upon a pin 0, and the contact I) is yie.dingly pressed against the contact a by the spring 12. In the embodiment of the invention illustrated in Figs. 1 and 2, the oscillation of the lever (l is produced by the cam disk h. which engages an insulated block In carried by one arm f of the bell-crank lever, which is pivotally mounted upon a pin g andv has its other arm fprovided with an insulating block R that engages one arm of the lever d at a point co-axial with the axis -of the r0tatin'g'" disk h. With this construction the rotation of the cam disk It causes the arm f to rock the arm f'and lever zl, so as to move the contact I) away from the contact a. The pin 9 is fixed to a sheave l capable of being'turned, which oscillates about an. axis co-axial with the cam disk and is provided with a hand engaging member 2'.

With this construction movement of the lever 2' about the axis of the cam It will cause the fiber block 7:: to shift in an arc about said axis and in consequence the action of the time will be changed or varied.

In the embodiment of the invention illustrated in Figs. 3 and 4, a designates the stationary contact with which cooperates a movable contact b supported by one arm d of a' double-ended lever, which is pivoted on a fulcrum (3.

The movable contact I) is movably pressed against the stationary contact by means of a leaf spring e and the second arm d of the double-ended lever extends to the axis of the cam h. A member Z which is movable about said axis carries on a fulcrum g a bell crank lever having arms f and f the arm f bearing upon the arm d of the double-ended lever and the arm f liaving an insulating block k engaging the periphery of the cam disk il \Vith this construction rotation of the cam disk b will cause the bell crank lever forth specifically a mechanism by whichvarying of the movement of the movable contact does not changethe leverage of the double-ended lever carrying the movable contact. In other words the cam operated members always hear at the same point upon the double-ended lever:

Having now particularly described and ascertaind the nature of my saidinvention, what I desire to secure by Letters Patent 1s:-- I v 1. In an ignition apparatus a stationary contact, a movable contact cooperating therewith to make and break a circuit, a pivotally mounted two armed lever carrying the movable contact, a rotatable cam, a member movable about the axis of said cam and carrying a fulcrum, and a bell crank lever pivotally mounted upon said fulcrum and having one of its arms engaging the cam and its other arm engaging the double armed lever.

2. In an ignition apparatus a stationarycontact, a movable contact cooperating therewith to make and break a circuit, a pivotally mounted double armed lever having one of its arms supporting the movable contact a rotatable cam, a member movable about the axis of said cam, and a bell crank lever pivotally mounted upon the last named .member and having one of its arms projecting into close proximity of the cam and engaging one arm of the double-armed lever and its other arm engaging said cam.

3. In an ignition apparatus a stationary contact. a movable contact cooperating therewith to make and break a circuit. a pivotally mounted double-armed lever having one of its arms supporting said movable contact, a spring for moving the last named arm in one direction, a rotatable cam, a member movable about the axis of said cam and a bell crank lever pivotally mounted upon the last named member and having one of its arms engaging the other arm of the double armed lever in close.

proximity to the axis of the disk oi", the

other arm, and bell crank lever engaging the periphery of said cam disk.

In testimony whereof I have signed my name to this specification.

FREDERICK BILLON. 

